package chapter4.Example15;
class Animal{
    public void shout(){
        System.out.println("喵喵喵.....");
    }
}
class Dog extends Animal{
    public void shout(){
        System.out.println("喵喵喵.....");
    }
    public void eat(){
        System.out.println("吃骨头....");
    }
}
public class Example15 {
    public static void main(String[] args) {
            Dog dog = new Dog();
                Animal an = dog;
                an.shout();
    }
}
